Required metadata for each DOORS data record:

• the resource label with a globally unique URI (or IRI) enabling non-semantic string queries of labels;
• the resource location with a URL (or IDN), possibly the same as the URI (or IRI) if resolvable, and any associated URLs (or IDNs) enabling query responses;
• the record provenance with identification of the
  • resource owner,
  • authoritative primary PORTAL registry, and
  • authoritative primary DOORS directory;
• the record distribution with parameters for time-to-live caching and expiring as well as extent of redistribution for non-authoritative secondary DOORS directories.

• the resource tags, if registered at the governing registry, including a tokenized name and/or phrases enabling non-semantic string queries of tags;
• the resource description with an RDF mini-document, a collection of RDF triples that reference OWL ontologies, enabling semantic reasoning queries of descriptions;
• the record signature with XML-Signatures for the
  • resource owner,
  • authoritative primary PORTAL registry, and
  • authoritative primary DOORS directory.